I have the Parrot MKi9200 fitted to my Jazz 04 S.
If you fit it using the iso connector which you have to, it will do everything that you need it to do.
You cant fit the parrot through the line out.
The parrot also has a built in amplifier as well as a graphic equaliser, it really does sound much better that the factory unit.
You will need to remove the centre console to fit the base unit under, and a little bit of thought is needed as where to place the screen and the contol button.
I can take a picture of mine if you want to see how i did mine.
Jamey